<template>
    <div>
     <!-- 面包屑导航 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
       </el-breadcrumb>
        <el-card>
             <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable= 'false'
                >
            </el-alert>
            <!-- 进度条 -->
            <el-steps :space="200" :active= "activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->   
              <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm"> 
                <el-tabs :tab-position="'left'" style="height:400px;" v-model= "activeIndex" :before-leave='beforeTabLeave' @tab-click ='tabClicked'>
                    <el-tab-pane label="基本信息" name='0'>
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model= "addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model= "addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model= "addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model= "addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                expand-trigger="hover"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数"  name='1'>
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label= "item.attr_name" v-for="item in manyTableData" :key= "item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">{{item.attr_vals}}
                                <el-checkbox :label="cd" v-for="(cd,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性"  name='2'>
                        <el-form-item :label= "item.attr_name" v-for="item in onlyTableData" :key="item.attr_id" >
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片"  name='3'>
                        <!-- action 是要被传输到的地方 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                            </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容"  name='4'>
                        <!-- 富文本编辑器组件 -->
                         <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                         <!-- 添加商品的按钮 -->
                         <el-button type='primary' @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
                </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="30%">
            <img :src="previewPath" alt="" class='previewImg'>
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return{
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number:0,
                // 商品所属的分类组
                goods_cat: [],
                pics: [],
                // 商品的详情描述
                goods_introduce:''

            },
            addFormRules: {
                goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' } 
                ],
                goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' } 
                ],
                goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' } 
                ],
                goods_number: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }  
                ],
                goods_cat: [
                { required: true, message: '请输入商品分类', trigger: 'blur' }  
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
           const {data:res} = await this.$http.get('categories')
           if(res.meta.status !== 200) {
               return this.$message.console.error('获取商品分类数据失败！')
           }
           this.catelist = res.data
        },
        // 级联选择器变化触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3) {
               this.addForm.goods_cat = []
            }
        },
        // 离开和进入标签页的名称
        beforeTabLeave(activeName,oldactivename) {
            if(oldactivename === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请选择分类')
                return false
            }
            console.log(oldactivename)
        },
        async tabClicked() {
        //  证明访问的是动态参数面版
        if(this.activeIndex === '1') {
            // 获取三级分类的id 可以将三级分类的id this.addForm.goods_cat[2] 用计算属性
           const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
            if(res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败')
            }
            res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manyTableData = res.data
        }else if(this.activeIndex === '2') {
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
           if(res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败')
        }
        console.log(res.data)
        this.onlyTableData = res.data
        }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 
        handleRemove(file) {
            console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中找到这个图片对应的索引值
            const i = 
            this.addForm.pics.findIndex(x => x.pic === filePath
            )
            // 3.调用数组的splice方法把图片信息对象从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        fileList2() {},
        // 监听图片上传成功的事件
        handleSuccess(response) {
        // 拼接得到一个图片信息对象
        const picInfo = {pic: response.data.tmp_path}
        // 将图片信息对象 push掉pics数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm)
        },
        // 添加商品
        add() {
            this.$refs.addFormRef.validate(
               async valid => {
                    if(!valid) {
                        return this.$message.error('请填写必要的表单')
                    }
                    // 执行添加的逻辑
                    // lodash clonDeep(obj)
                   const form = _.cloneDeep(this.addForm)
                   form.goods_cat = form.goods_cat.join(',')
                //    处理动态参数 
                this.manyTableData.forEach(item => {
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id ,attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                   console.log(form)
                //    发起请求添加商品
                //  商品的名称，必须是唯一的
                const { data:res } = await this.$http.post('goods',form)
                if(res.meat.status !== 200) {
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
                }
            )
        }
    },
    computed: {
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
    .el-steps{
        margin-top: 30px;
    }
    .el-tabs{
        margin-top: 40px;
    }
    .previewImg{
        width:100%;

    }
</style>
